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Effect of bedding structural diversity of coal on permeability evolution and gas disasters control with coal mining

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Abstract

Bedding structure has affected gas flow in coal seam greatly, which also controls gas permeation direction and gas extraction results, and finally it has tremendous influence on prevention and control of gas disaster accidents. Combined with engineering practice of gas disaster prevention and control in China, in this paper, permeability evolution of nature coal in different bedding directions in the condition of loading is studied, and the results showed that in three directions of bedding fractures, permeability of coal which is parallel to bedding planes is the highest; it would be much easier for gas percolation along the bedding planes than other directions. In the unloading process, tension–shear destruction appears in coal sample which is oblique to bedding along the bedding planes, with a sudden increase in permeability. It is difficult for the crack damage from loading process to recover in unloading process, that is, permeability of unloading isn’t just a simple reverse process of loading. Combined with the permeability evolution of the three coal samples in the whole process, three permeability evolution models which include elasticity, plasticity and fracture are proposed. Based on the experimental results, gas extraction using boreholes along coal seam and through coal seam is compared during depressurized mining. Due to the bedding structure of coal seam, a large area of fracture network of “boreholes–bedding fractures” is formed among boreholes through coal seam and bedding structure, which makes the good effect of gas extraction using boreholes through coal seam. Research results will be of important guiding significance for choosing the best gas extraction scheme, layout of setting parameters of drilling boreholes and gas disaster prevention in the underground coal mine.

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Acknowledgments

This work was carried out with funding from the National Basic Research Development Program of China (Grant No. 2011CB201204); and National Natural Science Foundation of China (Grant Nos. 51304070, 51074160, U1361205, 51204173). The authors wish to thank these two organizations for the support provided. They also wish to thank there viewers and editors for their constructive comments and suggestions in improving the manuscript.

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Authors and Affiliations

  1. National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou, 221008, Jiangsu, China

    Rongkun Pan, Yuanping Cheng, Liang Yuan & Jun Dong

  2. Department of Safety and Science Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan, China

    Rongkun Pan & Minggao Yu

  3. Huainan Mining (Group) Co. Ltd, Huainan, 232001, China

    Liang Yuan

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  1. Rongkun Pan
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  2. Yuanping Cheng
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  3. Liang Yuan
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  4. Minggao Yu
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  5. Jun Dong
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Correspondence to Yuanping Cheng.

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Pan, R., Cheng, Y., Yuan, L. et al. Effect of bedding structural diversity of coal on permeability evolution and gas disasters control with coal mining. Nat Hazards 73, 531–546 (2014). https://doi.org/10.1007/s11069-014-1086-7

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  • DOI: https://doi.org/10.1007/s11069-014-1086-7

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